Now that youve purchased the optra k designed to provide you fast reliable printing at an affordable price look to lexmark for the supplies designed in conjunction with your printer the print unit which came already installed in your optra k has a long life of 32 500 pages at 5 print coverage but when it comes time to replace it the removal and installation is a piece of cake this print unit ships with a 25k toner cartridge to get you started printing right away replacement cartridg